Dan,
I don't know of any photo's of the whole unit but at Illinois in the Civil War under photo album there is a pic of 1st Lt. Levi Davis of company G if you are interested. You might try the Abraham Lincoln Museum and Library. They might have a photo of the whole unit or maybe different companies. There is a way to search their data base. I am not sure how to do it but it can be done. If you have trouble doing it, contact the web master with details and maybe they will look for you. I don't know where you are but you would have to go to Springfield to view any pics they might have.
Frank